Image reading apparatus for correcting density levels

Details Image reading apparatus for correcting density levels Image reading apparatus for correcting density levels

1994-10-24

1997-03-04

Couso, Jose L.

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

G06K 938

Patent

active

056088230

ABSTRACT:
An image reading apparatus includes an image sensing unit for photoelectrically reading an original image, and outputting an image signal, a converter unit for converting the image signal from the image sensing unit into density data representing density levels of a plurality of steps, a detection unit for detecting frequencies of appearance in units of density levels of the density data from the converter unit, and a correction unit for correcting the density levels expressed by the density data from the converter unit on the basis of the frequencies of appearance detected by the detection unit.

REFERENCES:
patent: 4791678 (1988-12-01), Iwase et al.
patent: 4792979 (1988-12-01), Nomura et al.
patent: 4839696 (1989-06-01), Ohtani
patent: 4907286 (1990-03-01), Yamada

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